\Dec"ade\, n. [F. d['e]cade, L. decas, -adis, fr. Gr. ?,
fr. de`ka ten. See {Ten}.]
A group or division of ten; esp., a period of ten years; a
decennium; as, a decade of years or days; a decade of
soldiers; the second decade of Livy. [Written also {decad}.]
During this notable decade of years. --Gladstone.